![]() |
Home | Libraries | People | FAQ | More |
The library has the full repertoire of single character parsers for character
classification. This includes the usual alnum,
alpha, digit, xdigit,
etc. parsers. These parsers have an associated Character
Encoding Namespace. This is needed when doing basic operations
such as inhibiting case sensitivity.
// forwards to <boost/spirit/home/qi/char/char_class.hpp> #include <boost/spirit/include/qi_char_class.hpp>
Also, see Include Structure.
|
Name |
|---|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
In the table above, ns
represents a Character
Encoding Namespace.
Notation
Semantics of an expression is defined only where it differs from, or
is not defined in PrimitiveParser.
|
Expression |
Semantics |
|---|---|
|
|
Matches alpha-numeric characters |
|
|
Matches alphabetic characters |
|
|
Matches spaces or tabs |
|
|
Matches control characters |
|
|
Matches numeric digits |
|
|
Matches non-space printing characters |
|
|
Matches lower case letters |
|
|
Matches printable characters |
|
|
Matches punctuation symbols |
|
|
Matches spaces, tabs, returns, and newlines |
|
|
Matches upper case letters |
|
|
Matches hexadecimal digits |
The character type of the Character Encoding Namespace,
ns.
O(N)
![]() |
Note |
|---|---|
The test harness for the example(s) below is presented in the Basics Examples section. |
Some using declarations:
using boost::spirit::ascii::alnum; using boost::spirit::ascii::blank; using boost::spirit::ascii::digit; using boost::spirit::ascii::lower;
Basic usage:
test_parser("1", alnum); test_parser(" ", blank); test_parser("1", digit); test_parser("a", lower);